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Effect of Recombinant Human Growth Hormone Administration on Body Composition and Vascular Function and Structure in Old Male Wistar Rats

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Abstract

The process of ageing affects negatively both cardiovascular system and body composition. On the other hand, the hormones of the somatotrophic axis, growth hormone (GH) and insulin-like growth factor-I (IGF-I), whose production is reduced by age, are involved in the regulation of the cardiovascular system. The aim of this study was to investigate the effect of GH on body composition, vascular function and structure in old male rats. Old (20 months) and adult (4 months) male Wistar rats were used. One group of old animals was treated with GH for 4 weeks. Periepididimary fat weight, Specific Gravity Index (SGI), dose responses to Acetylcholine (ACh), Isoproterenol (Iso), Phenylephrine (Phe) and ACh in the presence of N G-nitro-l-arginine metylester (l-NAME; ACh+l-NAME), as well as vascular morphology in aortic rings, were studied. Old rats showed increased fat weight and decreased SGI as compared to adult animals. GH increased SGI and tended to reduce fat weight. Old rats showed an impairment in the vasodilator response to ACh and Iso; GH significantly improved the vasodilatation induced by Iso, whereas the response to ACh was not significantly enhanced by GH treatment. There were no significant differences between adult and old rats in the contractile response to Phe, and GH did not show any effect. Contraction induced by ACh+l-NAME was higher in old rats as compared to adults, and treatment with GH significantly reduced this response. Aortic media area was increased in old rats, and GH administration reduced this parameter. In conclusion, GH shows beneficial effects on body composition, as well as on vascular function and morphology in old male rats.

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Abbreviations

rhGH:

recombinant human growth hormone

IGF-1:

insulin-like growth factor 1

GHD:

growth hormone deficiency

SGI:

specific gravity index

KCl:

potassium chloride

ACh:

acetylcholine

Iso:

isoproterenol

SNP:

sodium nitroprusside

Phe:

phenylephrine

l-NAME:

NG-nitro-l-arginine methylester

NO:

nitric oxide

PGI2 :

prostacyclin

EDHF:

endothelial-derived hyperpolarizing factor

TXA2 :

tromboxane A2

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Authors and Affiliations

  1. Department of Physiology, School of Medicine, Complutense University, Avda. Complutense s/n, 28040, Madrid, Spain

    Carmen Castillo, Mar Cruzado, Carmen Ariznavarreta, Pablo Gil-Loyzaga, Vicente Lahera, Victoria Cachofeiro & Jesús A. F. Tresguerres

  2. Department of Surgery II (Neurobiology of Hearing), School of Medicine, Complutense University, Madrid, Spain

    Pablo Gil-Loyzaga

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  1. Carmen Castillo
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  2. Mar Cruzado
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  3. Carmen Ariznavarreta
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  4. Pablo Gil-Loyzaga
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  5. Vicente Lahera
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  6. Victoria Cachofeiro
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  7. Jesús A. F. Tresguerres
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Correspondence to Jesús A. F. Tresguerres.

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Castillo, C., Cruzado, M., Ariznavarreta, C. et al. Effect of Recombinant Human Growth Hormone Administration on Body Composition and Vascular Function and Structure in Old Male Wistar Rats. Biogerontology 6, 303–312 (2005). https://doi.org/10.1007/s10522-005-4805-3

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